I think they are young G. crassilabris. Check this thread: http://www.cichlid.org/forums/showthread.php?t=4948
Scroll down and you'll see that Dean Hougen posted one of his juveniles. It looks just like these fish. IMO the ones in your video don't look like Satanoperca.
Some pictures of young G. pellegrini look very similar as well.
im not sure if there steini because my steini fry i raised are about 3/4 inch and they already have color. just my opinion thoSteini juveniles look pretty similar, too. I'm guessing it will become more obvious as the colors develop. That's the problem with a lot of young geos... they look so similar until they're about 3 - 4".